Long-period eigenoscillations of the solar interior: 1-3 yr, 20-40 yr, and 1500-20000 year modes

Details Long-period eigenoscillations of the solar interior: 1-3 yr, 20-40 yr, and 1500-20000 year modes Long-period eigenoscillations of the solar interior: 1-3 yr, 20-40 yr, and 1500-20000 year modes

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..167s&link_type=abstract

In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:

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Hydrodynamics, Sun: Oscillations, Sun: Interior, Sun: Rotation

Scientific paper

Waves with periods much larger than the rotation period become trapped in the solar radiative interior. The modelling considers compressible, nonadiabatic, Rossby- like modes (ɛ-mechanism and radiative losses are taken into account) for a very small latitudinal gradient of rotation, without an arbitrary choice of other free parameters. We found global vorticity modes in 3 separate period ranges of ≍1-3 yr, 20-40 yr, and 1500-20000 yr which are maximum unstable. The discovered resonant cavity modes (called R-modes) are different from the known r-modes. We discuss some prospects to develop the theory of R-modes as a driver of the dynamics in the convective zone which could explain e.g., observed short-term fluctuations of rotation, a control of the solar magnetic cycle, and abrupt changes of terrestrial climate in the past (Dansgaard-Oeschger events).

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